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參數(shù)資料
| 型號： | AD9266BCPZRL7-20 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 20MSPS 32LFCSP |
| 標準包裝： | 1,500 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 20M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 63mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 32-LFCSP-WQ（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
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Data Sheet
AD9266
Rev. A | Page 19 of 32
VOLTAGE REFERENCE
A stable and accurate 1.0 V voltage reference is built into the
AD9266. The VREF can be configured using either the internal
1.0 V reference or an externally applied 1.0 V reference voltage.
The various reference modes are summarized in the sections that
follow. The Reference Decoupling section describes the best
practices for PCB layout of VREF.
Internal Reference Connection
A comparator within the AD9266 detects the potential at the
SENSE pin and configures the reference into two possible modes,
which are summarized in Table 10. If SENSE is grounded, the
reference amplifier switch is connected to the internal resistor
divider (see Figure 42), setting VREF to 1.0 V.
VREF
SENSE
0.5V
ADC
SELECT
LOGIC
0.1F
1.0F
VIN–
VIN+
ADC
CORE
08678-
012
Figure 42. Internal Reference Configuration
If the internal reference of the AD9266 is used to drive multiple
converters to improve gain matching, the loading of the reference
by the other converters must be considered. Figure 43 shows
how the internal reference voltage is affected by loading.
0
–3.0
0
2.0
LOAD CURRENT (mA)
RE
F
E
RE
NCE
V
O
L
T
AG
E
RRO
R
(
%) –0.5
–1.0
–1.5
–2.0
–2.5
0.2
0.4
0.6
0.8
1.0
1.4
1.6
1.8
1.2
INTERNAL VREF = 0.995V
08678-
014
Figure 43. VREF Accuracy vs. Load Current
External Reference Operation
The use of an external reference may be necessary to enhance
the gain accuracy of the ADC or improve thermal drift charac-
teristics. Figure 44 shows the typical drift characteristics of the
internal reference in 1.0 V mode.
4
3
2
1
0
–1
–2
–3
–4
–5
–6
–40
–20
0
20
40
60
80
TEMPERATURE (°C)
V
RE
F
E
RRO
R
(
mV
)
VREF ERROR (mV)
08678-
052
Figure 44. Typical VREF Drift
When the SENSE pin is tied to AVDD, the internal reference is
disabled, allowing the use of an external reference. An internal
reference buffer loads the external reference with an equivalent
7.5 k load (see Figure 28). The internal buffer generates the posi-
tive and negative full-scale references for the ADC core. Therefore,
the external reference must be limited to a maximum of 1.0 V.
Table 10. Reference Configuration Summary
Selected Mode
SENSE Voltage (V)
Resulting VREF (V)
Resulting Differential Span (V p-p)
Fixed Internal Reference
AGND to 0.2
1.0 internal
2.0
Fixed External Reference
AVDD
1.0 applied to external VREF pin
2.0
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| AD9266BCPZRL7-40 | 制造商:Analog Devices 功能描述:16 BIT, 40 MSPS 1.8V SINGLE ADC - Tape and Reel 制造商:Analog Devices 功能描述:IC ADC 16BIT 40MSPS 32LFCSP 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC 16 Bit 40 MSPS 1.8V Single ADC 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD9266BCPZRL7-65 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 65 MSPS 1.8V Single ADC RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風格: 封裝 / 箱體: |
| AD9266BCPZRL7-80 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 80 MSPS 1.8V Single ADC RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風格: 封裝 / 箱體: |
| AD9266TCPZ-65EP | 制造商:Analog Devices 功能描述:16 BIT, 65 MSPS 1.8V SINGLE ADC EP - Trays 制造商:Analog Devices 功能描述:IC ADC 16BIT 65MSPS 32LFCSP 制造商:Analog Devices 功能描述:16 Bit 65 MSPS 1.8V Single ADC EP 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD9266TCPZRL7-65EP | 制造商:Analog Devices 功能描述:16 BIT, 65 MSPS 1.8V SINGLE ADC EP - Tape and Reel 制造商:Analog Devices 功能描述:IC ADC 16BIT 65MSPS 32LFCSP 制造商:Analog Devices 功能描述:CONVERTER - ADC |
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